Finding the Fourth Proportional to 9,312.56, 12,869.76 and 7,631.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.56 : 12,869.76 = 7,631.31 : x
2. Step 2: Convert to fraction form
   9,312.56/12,869.76 = 7,631.31/x
3. Step 3: Cross multiply
   9,312.56x = 12,869.76 × 7,631.31
4. Step 4: Simplify right side
   9,312.56x = 98,213,128.19
5. Step 5: Solve for x
   x = 98,213,128.19/9,312.56
6. Step 6: Final answer
   x = 10,546.31